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use crate::{
serdeize::{self, Data, PrecReq, PrecVal},
Assign, Rational,
};
use serde::{
de::{Deserialize, Deserializer, Error as DeError},
ser::{Serialize, Serializer},
};
impl Serialize for Rational {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
let prec = PrecVal::Zero;
let radix =
if self.numer().significant_bits() <= 32 && self.denom().significant_bits() <= 32 {
10
} else {
16
};
let value = self.to_string_radix(radix);
let data = Data { prec, radix, value };
serdeize::serialize("Rational", &data, serializer)
}
}
impl<'de> Deserialize<'de> for Rational {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Rational, D::Error> {
let (radix, value) = de_data(deserializer)?;
let p = Rational::parse_radix(&value, radix).map_err(DeError::custom)?;
Ok(Rational::from(p))
}
fn deserialize_in_place<D: Deserializer<'de>>(
deserializer: D,
place: &mut Rational,
) -> Result<(), D::Error> {
let (radix, value) = de_data(deserializer)?;
let p = Rational::parse_radix(&value, radix).map_err(DeError::custom)?;
place.assign(p);
Ok(())
}
}
fn de_data<'de, D: Deserializer<'de>>(deserializer: D) -> Result<(i32, String), D::Error> {
let Data { prec, radix, value } =
serdeize::deserialize("Rational", PrecReq::Zero, deserializer)?;
match prec {
PrecVal::Zero => {}
_ => unreachable!(),
}
serdeize::check_range("radix", radix, 2, 36)?;
Ok((radix, value))
}
#[cfg(test)]
mod tests {
use crate::{misc::UnwrappedCast, Assign, Rational};
use serde_json::json;
fn assert(a: &Rational, b: &Rational) {
assert_eq!(a, b);
}
enum Check<'a> {
SerDe(&'a Rational),
De(&'a Rational),
DeError(&'a str),
}
impl Check<'_> {
fn check(self, radix: i32, value: &'static str) {
use crate::serdeize::test::*;
use byteorder::{LittleEndian, WriteBytesExt};
use serde_test::Token;
use std::io::Write;
let tokens = [
Token::Struct {
name: "Rational",
len: 2,
},
Token::Str("radix"),
Token::I32(radix),
Token::Str("value"),
Token::Str(value),
Token::StructEnd,
];
let json = json!({
"radix": radix,
"value": value,
});
let mut bincode = Vec::<u8>::new();
bincode.write_i32::<LittleEndian>(radix).unwrap();
bincode
.write_u64::<LittleEndian>(value.len().unwrapped_cast())
.unwrap();
bincode.write_all(value.as_bytes()).unwrap();
match self {
Check::SerDe(r) => {
serde_test::assert_tokens(r, &tokens);
json_assert_value(r, &json, assert);
let in_place = Rational::from((0xbad, 3));
bincode_assert_value(r, &bincode, assert, in_place);
}
Check::De(r) => {
serde_test::assert_de_tokens(r, &tokens);
json_assert_de_value(r, json, assert);
bincode_assert_de_value(r, &bincode, assert);
}
Check::DeError(msg) => {
serde_test::assert_de_tokens_error::<Rational>(&tokens, msg);
}
}
}
}
#[test]
fn check() {
Check::DeError("radix 1 less than minimum 2").check(1, "0");
Check::DeError("radix 37 greater than maximum 36").check(37, "0");
let mut r = Rational::new();
Check::SerDe(&r).check(10, "0");
Check::De(&r).check(10, "+0/1");
r.assign((11_i64, -0xffff_ffff_i64));
Check::SerDe(&r).check(10, "-11/4294967295");
Check::De(&r).check(16, "-b/ffffffff");
Check::De(&r).check(16, "-b0/ffffffff0");
r.assign((-11_i64, -0x1_0000_0000_i64));
Check::SerDe(&r).check(16, "b/100000000");
}
}